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/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / Orcas / SP / wpf / src / Core / CSharp / System / Windows / Media / HostVisual.cs / 1 / HostVisual.cs
//------------------------------------------------------------------------------ // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Host visual. // //----------------------------------------------------------------------------- namespace System.Windows.Media { using System; using System.Windows.Threading; using System.Windows.Media; using System.Windows.Media.Composition; using System.Diagnostics; using System.Collections; using System.Collections.Generic; using MS.Internal; using System.Resources; using System.Runtime.InteropServices; using MS.Win32; using System.Threading; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; ////// Host visual. /// public class HostVisual : ContainerVisual { //--------------------------------------------------------------------- // // Constructors // //--------------------------------------------------------------------- #region Constructors ////// /// public HostVisual() { // // Set NodeUsesRealizationCaches flag, so that UpdateRealizations // will be called when change affecting realizations occurred in // the ancestor. UpdateRealizations override will propagate this // infromation to the hosted visual tree. // SetFlags(true, VisualFlags.NodeUsesRealizationCaches); } #endregion Constructors //---------------------------------------------------------------------- // // Protected Methods // //--------------------------------------------------------------------- #region Protected Methods ////// HitTestCore /// protected override HitTestResult HitTestCore( PointHitTestParameters hitTestParameters) { // // HostVisual never reports itself as being hit. To change this // behavior clients should derive from HostVisual and override // HitTestCore methods. // return null; } ////// HitTestCore /// protected override GeometryHitTestResult HitTestCore( GeometryHitTestParameters hitTestParameters) { // // HostVisual never reports itself as being hit. To change this // behavior clients should derive from HostVisual and override // HitTestCore methods. // return null; } #endregion Protected Methods //---------------------------------------------------------------------- // // Internal Methods // //---------------------------------------------------------------------- #region Internal Methods ////// /// internal override Rect GetContentBounds() { return Rect.Empty; } ////// /// internal override void RenderContent(RenderContext ctx, bool isOnChannel) { // // Create and register RenderComplete event handler // that will be used to propagate state changes to // the hosted visual target. // if (_propagateState == null) { _propagateState = new EventHandler(PropagateState); MediaContext.From(Dispatcher).RenderComplete += _propagateState; } // // Make sure that the visual target is properly hosted. // EnsureHostedVisualConnected(ctx.Channel); } ////// /// internal override void FreeContent(DUCE.Channel channel) { if (!channel.IsLayeredWindowChannel) { // // Unregister RenderComplete event handler if one is registered. // if (_propagateState != null) { MediaContext.From(Dispatcher).RenderComplete -= _propagateState; _propagateState = null; } // // Disconnect hosted visual from this channel. // using (CompositionEngineLock.Acquire()) { DisconnectHostedVisual( channel, /* removeChannelFromCollection */ true); } base.FreeContent(channel); } } ////// /// internal override void UpdateRealizations(RealizationContext ctx) { // // If transform in one of the the ancestors has chnaged, // propagate transform information in order to correclty // compute realizations in the hosted visual tree. State // change will be propagated when channel is committed. // Matrix transform = ctx.TransformStack.Peek(); if (_state.worldTransform != transform) { _state.flags |= CompositionTarget.HostStateFlags.WorldTransform; _state.worldTransform = transform; } // // } ////// /// internal void PropagateState(object sender, EventArgs e) { // // If state has changed, propagate the change to the // visual target and reset the state. // if (_state.flags != 0) { VisualTarget.HostState state = _state; using (CompositionEngineLock.Acquire()) { if (_target != null) { _target.PropagateState(ref state); } } _state.flags = 0; } } ////// /// internal void BeginHosting(VisualTarget target) { // // This method is executed on the visual target thread. // Debug.Assert(target != null); Debug.Assert(target.Dispatcher.Thread == Thread.CurrentThread); using (CompositionEngineLock.Acquire()) { // // Check if another target is already hosted by this // visual and throw exception if this is the case. // if (_target != null) { throw new InvalidOperationException( SR.Get(SRID.VisualTarget_AnotherTargetAlreadyConnected) ); } _target = target; // // If HostVisual and VisualTarget on same thread, then call Invalidate // directly. Otherwise post invalidate message to the host visual thread // indicating that content update is required. // if (this.CheckAccess()) { Invalidate(); } else { Dispatcher.BeginInvoke( DispatcherPriority.Normal, (DispatcherOperationCallback)delegate(object args) { Invalidate(); return null; }, null ); } } } ////// /// internal void EndHosting() { // // This method is executed on the visual target thread. // using (CompositionEngineLock.Acquire()) { Debug.Assert(_target != null); Debug.Assert(_target.Dispatcher.Thread == Thread.CurrentThread); DisconnectHostedVisualOnAllChannels(); _target = null; } } ////// Should be called from the VisualTarget thread /// when it is safe to access the composition node /// and out of band channel from the VisualTarget thread /// to allow for the handle duplication/channel commit /// internal object DoHandleDuplication(object parameters) { ArrayList paramArray = parameters as ArrayList; DUCE.ResourceHandle targetsHandle = DUCE.ResourceHandle.Null; DUCE.Channel channel = paramArray[0] as DUCE.Channel; long _requestingGenerationId = (long)paramArray[1]; using (CompositionEngineLock.Acquire()) { // // We need to ensure that the generation Id is the same now as // it was when this Invoke was posted. There are certain situations // in which Connect/Disconnect may have occurred on one thread and // not the other, which would mean we'd try to duplicate a handle from // or to a stale channel. We use the generation Id to determine if both // threads are using the same transport. If they're not, we can safely // noop, because the last thread to process the Connect/Disconnect message // will remarshal itself to the new channel, causing this Invoke to // eventually be called again // if (_requestingGenerationId == MediaSystem.GenerationId) { targetsHandle = _target._contentRoot.DuplicateHandle(_target.OutOfBandChannel, channel); Debug.Assert(!targetsHandle.IsNull); _target.OutOfBandChannel.Commit(); } } return targetsHandle; } #endregion Internal Methods //--------------------------------------------------------------------- // // Private Methods // //---------------------------------------------------------------------- #region Private Methods ////// Connects the hosted visual on a channel if necessary. /// private void EnsureHostedVisualConnected(DUCE.Channel channel) { // // Conditions for connecting VisualTarget to Host Visual:- // 1. The channel on which we are rendering should not be synchronous. This // scenario is not supported currently. // 2. VisualTarget should not be null. // 3. They should not be already connected. // if (!(channel.IsSynchronous) && _target != null && !_connectedChannels.Contains(channel) && !channel.IsLayeredWindowChannel) { Debug.Assert(IsOnChannel(channel)); DUCE.ResourceHandle targetsHandle = DUCE.ResourceHandle.Null; bool doDuplication = true; // // If HostVisual and VisualTarget are on same thread, then we just addref // VisualTarget. Otherwise, if on different threads, then we duplicate // VisualTarget onto Hostvisual's channel. // if (_target.CheckAccess()) { Debug.Assert(_target._contentRoot.IsOnChannel(channel)); Debug.Assert(_target.OutOfBandChannel == MediaContext.CurrentMediaContext.OutOfBandChannel); bool created = _target._contentRoot.CreateOrAddRefOnChannel(channel, VisualTarget.s_contentRootType); Debug.Assert(!created); targetsHandle = _target._contentRoot.GetHandle(channel); } else { // // Duplicate the target's handle onto our channel. // // We must wait synchronously for the _targets Dispatcher to call // back and do handle duplication. We can't do handle duplication // on this thread because access to the _target CompositionNode // is not synchronized. If we duplicated here, we could potentially // corrupt the _target OutOfBandChannel or the CompositionNode // MultiChannelResource. We have to wait synchronously because // we need the resulting duplicated handle to hook up as a child // to this HostVisual. // ArrayList parameters = new ArrayList(2); parameters.Add(channel); parameters.Add((object)MediaSystem.GenerationId); object returnValue = _target.Dispatcher.Invoke( DispatcherPriority.Normal, TimeSpan.FromMilliseconds(1000), new DispatcherOperationCallback(DoHandleDuplication), parameters ); // // Duplication and flush is complete, we can resume processing // Only if the Invoke succeeded will we have a handle returned. // if (returnValue != null) { targetsHandle = (DUCE.ResourceHandle)returnValue; } else { // The Invoke didn't complete doDuplication = false; } } if (doDuplication) { if (!targetsHandle.IsNull) { using (CompositionEngineLock.Acquire()) { DUCE.CompositionNode.InsertChildAt( _proxy.GetHandle(channel), targetsHandle, 0, channel); } _connectedChannels.Add(channel); // // Indicate that that content composition root has been // connected, this needs to be taken into account to // properly manage children of this visual. // SetFlags(channel, true, VisualProxyFlags.IsContentNodeConnected); } } else { // // We didn't get a handle, because _target belongs to a // different thread, and the Invoke operation failed. We can't do // anything except try again in the next render pass. We can't // call Invalidate during the render pass because it pushes up // flags that are being modified within the render pass, so get // the local Dispatcher to do it for us later. // Dispatcher.BeginInvoke( DispatcherPriority.Normal, (DispatcherOperationCallback)delegate(object args) { Invalidate(); return null; }, null ); } } } ////// Disconnects the hosted visual on all channels we have /// connected it to. /// private void DisconnectHostedVisualOnAllChannels() { foreach (DUCE.Channel channel in _connectedChannels) { DisconnectHostedVisual( channel, /* removeChannelFromCollection */ false); } _connectedChannels.Clear(); } ////// Disconnects the hosted visual on a channel. /// private void DisconnectHostedVisual( DUCE.Channel channel, bool removeChannelFromCollection) { if (_target != null && _connectedChannels.Contains(channel)) { DUCE.CompositionNode.RemoveChild( _proxy.GetHandle(channel), _target._contentRoot.GetHandle(channel), channel ); // // Release the targets handle. If we had duplicated the handle, // then this removes the duplicated handle, otherwise just decrease // the ref count for VisualTarget. // _target._contentRoot.ReleaseOnChannel(channel); SetFlags(channel, false, VisualProxyFlags.IsContentNodeConnected); if (removeChannelFromCollection) { _connectedChannels.Remove(channel); } } } ////// Invalidate this visual. /// private void Invalidate() { SetFlagsOnAllChannels(true, VisualProxyFlags.IsContentDirty); PropagateChangedFlags(); } #endregion Private Methods //--------------------------------------------------------------------- // // Private Fields // //--------------------------------------------------------------------- #region Private Fields private EventHandler _propagateState; private VisualTarget.HostState _state; ////// The hosted visual target. /// ////// This field is free-threaded and should be accessed from under a lock. /// private VisualTarget _target; ////// The channels we have marshalled the visual target composition root. /// ////// This field is free-threaded and should be accessed from under a lock. /// private List_connectedChannels = new List (); #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved. //------------------------------------------------------------------------------ // // // Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Host visual. // //----------------------------------------------------------------------------- namespace System.Windows.Media { using System; using System.Windows.Threading; using System.Windows.Media; using System.Windows.Media.Composition; using System.Diagnostics; using System.Collections; using System.Collections.Generic; using MS.Internal; using System.Resources; using System.Runtime.InteropServices; using MS.Win32; using System.Threading; using SR=MS.Internal.PresentationCore.SR; using SRID=MS.Internal.PresentationCore.SRID; ////// Host visual. /// public class HostVisual : ContainerVisual { //--------------------------------------------------------------------- // // Constructors // //--------------------------------------------------------------------- #region Constructors ////// /// public HostVisual() { // // Set NodeUsesRealizationCaches flag, so that UpdateRealizations // will be called when change affecting realizations occurred in // the ancestor. UpdateRealizations override will propagate this // infromation to the hosted visual tree. // SetFlags(true, VisualFlags.NodeUsesRealizationCaches); } #endregion Constructors //---------------------------------------------------------------------- // // Protected Methods // //--------------------------------------------------------------------- #region Protected Methods ////// HitTestCore /// protected override HitTestResult HitTestCore( PointHitTestParameters hitTestParameters) { // // HostVisual never reports itself as being hit. To change this // behavior clients should derive from HostVisual and override // HitTestCore methods. // return null; } ////// HitTestCore /// protected override GeometryHitTestResult HitTestCore( GeometryHitTestParameters hitTestParameters) { // // HostVisual never reports itself as being hit. To change this // behavior clients should derive from HostVisual and override // HitTestCore methods. // return null; } #endregion Protected Methods //---------------------------------------------------------------------- // // Internal Methods // //---------------------------------------------------------------------- #region Internal Methods ////// /// internal override Rect GetContentBounds() { return Rect.Empty; } ////// /// internal override void RenderContent(RenderContext ctx, bool isOnChannel) { // // Create and register RenderComplete event handler // that will be used to propagate state changes to // the hosted visual target. // if (_propagateState == null) { _propagateState = new EventHandler(PropagateState); MediaContext.From(Dispatcher).RenderComplete += _propagateState; } // // Make sure that the visual target is properly hosted. // EnsureHostedVisualConnected(ctx.Channel); } ////// /// internal override void FreeContent(DUCE.Channel channel) { if (!channel.IsLayeredWindowChannel) { // // Unregister RenderComplete event handler if one is registered. // if (_propagateState != null) { MediaContext.From(Dispatcher).RenderComplete -= _propagateState; _propagateState = null; } // // Disconnect hosted visual from this channel. // using (CompositionEngineLock.Acquire()) { DisconnectHostedVisual( channel, /* removeChannelFromCollection */ true); } base.FreeContent(channel); } } ////// /// internal override void UpdateRealizations(RealizationContext ctx) { // // If transform in one of the the ancestors has chnaged, // propagate transform information in order to correclty // compute realizations in the hosted visual tree. State // change will be propagated when channel is committed. // Matrix transform = ctx.TransformStack.Peek(); if (_state.worldTransform != transform) { _state.flags |= CompositionTarget.HostStateFlags.WorldTransform; _state.worldTransform = transform; } // // } ////// /// internal void PropagateState(object sender, EventArgs e) { // // If state has changed, propagate the change to the // visual target and reset the state. // if (_state.flags != 0) { VisualTarget.HostState state = _state; using (CompositionEngineLock.Acquire()) { if (_target != null) { _target.PropagateState(ref state); } } _state.flags = 0; } } ////// /// internal void BeginHosting(VisualTarget target) { // // This method is executed on the visual target thread. // Debug.Assert(target != null); Debug.Assert(target.Dispatcher.Thread == Thread.CurrentThread); using (CompositionEngineLock.Acquire()) { // // Check if another target is already hosted by this // visual and throw exception if this is the case. // if (_target != null) { throw new InvalidOperationException( SR.Get(SRID.VisualTarget_AnotherTargetAlreadyConnected) ); } _target = target; // // If HostVisual and VisualTarget on same thread, then call Invalidate // directly. Otherwise post invalidate message to the host visual thread // indicating that content update is required. // if (this.CheckAccess()) { Invalidate(); } else { Dispatcher.BeginInvoke( DispatcherPriority.Normal, (DispatcherOperationCallback)delegate(object args) { Invalidate(); return null; }, null ); } } } ////// /// internal void EndHosting() { // // This method is executed on the visual target thread. // using (CompositionEngineLock.Acquire()) { Debug.Assert(_target != null); Debug.Assert(_target.Dispatcher.Thread == Thread.CurrentThread); DisconnectHostedVisualOnAllChannels(); _target = null; } } ////// Should be called from the VisualTarget thread /// when it is safe to access the composition node /// and out of band channel from the VisualTarget thread /// to allow for the handle duplication/channel commit /// internal object DoHandleDuplication(object parameters) { ArrayList paramArray = parameters as ArrayList; DUCE.ResourceHandle targetsHandle = DUCE.ResourceHandle.Null; DUCE.Channel channel = paramArray[0] as DUCE.Channel; long _requestingGenerationId = (long)paramArray[1]; using (CompositionEngineLock.Acquire()) { // // We need to ensure that the generation Id is the same now as // it was when this Invoke was posted. There are certain situations // in which Connect/Disconnect may have occurred on one thread and // not the other, which would mean we'd try to duplicate a handle from // or to a stale channel. We use the generation Id to determine if both // threads are using the same transport. If they're not, we can safely // noop, because the last thread to process the Connect/Disconnect message // will remarshal itself to the new channel, causing this Invoke to // eventually be called again // if (_requestingGenerationId == MediaSystem.GenerationId) { targetsHandle = _target._contentRoot.DuplicateHandle(_target.OutOfBandChannel, channel); Debug.Assert(!targetsHandle.IsNull); _target.OutOfBandChannel.Commit(); } } return targetsHandle; } #endregion Internal Methods //--------------------------------------------------------------------- // // Private Methods // //---------------------------------------------------------------------- #region Private Methods ////// Connects the hosted visual on a channel if necessary. /// private void EnsureHostedVisualConnected(DUCE.Channel channel) { // // Conditions for connecting VisualTarget to Host Visual:- // 1. The channel on which we are rendering should not be synchronous. This // scenario is not supported currently. // 2. VisualTarget should not be null. // 3. They should not be already connected. // if (!(channel.IsSynchronous) && _target != null && !_connectedChannels.Contains(channel) && !channel.IsLayeredWindowChannel) { Debug.Assert(IsOnChannel(channel)); DUCE.ResourceHandle targetsHandle = DUCE.ResourceHandle.Null; bool doDuplication = true; // // If HostVisual and VisualTarget are on same thread, then we just addref // VisualTarget. Otherwise, if on different threads, then we duplicate // VisualTarget onto Hostvisual's channel. // if (_target.CheckAccess()) { Debug.Assert(_target._contentRoot.IsOnChannel(channel)); Debug.Assert(_target.OutOfBandChannel == MediaContext.CurrentMediaContext.OutOfBandChannel); bool created = _target._contentRoot.CreateOrAddRefOnChannel(channel, VisualTarget.s_contentRootType); Debug.Assert(!created); targetsHandle = _target._contentRoot.GetHandle(channel); } else { // // Duplicate the target's handle onto our channel. // // We must wait synchronously for the _targets Dispatcher to call // back and do handle duplication. We can't do handle duplication // on this thread because access to the _target CompositionNode // is not synchronized. If we duplicated here, we could potentially // corrupt the _target OutOfBandChannel or the CompositionNode // MultiChannelResource. We have to wait synchronously because // we need the resulting duplicated handle to hook up as a child // to this HostVisual. // ArrayList parameters = new ArrayList(2); parameters.Add(channel); parameters.Add((object)MediaSystem.GenerationId); object returnValue = _target.Dispatcher.Invoke( DispatcherPriority.Normal, TimeSpan.FromMilliseconds(1000), new DispatcherOperationCallback(DoHandleDuplication), parameters ); // // Duplication and flush is complete, we can resume processing // Only if the Invoke succeeded will we have a handle returned. // if (returnValue != null) { targetsHandle = (DUCE.ResourceHandle)returnValue; } else { // The Invoke didn't complete doDuplication = false; } } if (doDuplication) { if (!targetsHandle.IsNull) { using (CompositionEngineLock.Acquire()) { DUCE.CompositionNode.InsertChildAt( _proxy.GetHandle(channel), targetsHandle, 0, channel); } _connectedChannels.Add(channel); // // Indicate that that content composition root has been // connected, this needs to be taken into account to // properly manage children of this visual. // SetFlags(channel, true, VisualProxyFlags.IsContentNodeConnected); } } else { // // We didn't get a handle, because _target belongs to a // different thread, and the Invoke operation failed. We can't do // anything except try again in the next render pass. We can't // call Invalidate during the render pass because it pushes up // flags that are being modified within the render pass, so get // the local Dispatcher to do it for us later. // Dispatcher.BeginInvoke( DispatcherPriority.Normal, (DispatcherOperationCallback)delegate(object args) { Invalidate(); return null; }, null ); } } } ////// Disconnects the hosted visual on all channels we have /// connected it to. /// private void DisconnectHostedVisualOnAllChannels() { foreach (DUCE.Channel channel in _connectedChannels) { DisconnectHostedVisual( channel, /* removeChannelFromCollection */ false); } _connectedChannels.Clear(); } ////// Disconnects the hosted visual on a channel. /// private void DisconnectHostedVisual( DUCE.Channel channel, bool removeChannelFromCollection) { if (_target != null && _connectedChannels.Contains(channel)) { DUCE.CompositionNode.RemoveChild( _proxy.GetHandle(channel), _target._contentRoot.GetHandle(channel), channel ); // // Release the targets handle. If we had duplicated the handle, // then this removes the duplicated handle, otherwise just decrease // the ref count for VisualTarget. // _target._contentRoot.ReleaseOnChannel(channel); SetFlags(channel, false, VisualProxyFlags.IsContentNodeConnected); if (removeChannelFromCollection) { _connectedChannels.Remove(channel); } } } ////// Invalidate this visual. /// private void Invalidate() { SetFlagsOnAllChannels(true, VisualProxyFlags.IsContentDirty); PropagateChangedFlags(); } #endregion Private Methods //--------------------------------------------------------------------- // // Private Fields // //--------------------------------------------------------------------- #region Private Fields private EventHandler _propagateState; private VisualTarget.HostState _state; ////// The hosted visual target. /// ////// This field is free-threaded and should be accessed from under a lock. /// private VisualTarget _target; ////// The channels we have marshalled the visual target composition root. /// ////// This field is free-threaded and should be accessed from under a lock. /// private List_connectedChannels = new List (); #endregion Private Fields } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. 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